Face mask shell



FIG. 1 is a front perspective view of a face mask shell showing our new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

CLAIM The ornamental design for a face mask shell, as shown and described. 